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Date:      Fri, 10 Feb 2012 00:02:13 +0000 (UTC)
From:      Konstantin Belousov <kib@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r231320 - in head/sys: kern sys
Message-ID:  <201202100002.q1A02DeH044144@svn.freebsd.org>
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Author: kib
Date: Fri Feb 10 00:02:13 2012
New Revision: 231320
URL: http://svn.freebsd.org/changeset/base/231320

Log:
  Mark the automatically attached child with PL_FLAG_CHILD in struct
  lwpinfo flags, for PT_FOLLOWFORK auto-attachment.
  
  In collaboration with:	Dmitry Mikulin <dmitrym juniper net>
  MFC after:	 1 week

Modified:
  head/sys/kern/kern_fork.c
  head/sys/kern/sys_process.c
  head/sys/sys/proc.h
  head/sys/sys/ptrace.h

Modified: head/sys/kern/kern_fork.c
==============================================================================
--- head/sys/kern/kern_fork.c	Fri Feb 10 00:02:03 2012	(r231319)
+++ head/sys/kern/kern_fork.c	Fri Feb 10 00:02:13 2012	(r231320)
@@ -1035,7 +1035,9 @@ fork_return(struct thread *td, struct tr
 			p->p_oppid = p->p_pptr->p_pid;
 			proc_reparent(p, dbg);
 			sx_xunlock(&proctree_lock);
+			td->td_dbgflags |= TDB_CHILD;
 			ptracestop(td, SIGSTOP);
+			td->td_dbgflags &= ~TDB_CHILD;
 		} else {
 			/*
 			 * ... otherwise clear the request.

Modified: head/sys/kern/sys_process.c
==============================================================================
--- head/sys/kern/sys_process.c	Fri Feb 10 00:02:03 2012	(r231319)
+++ head/sys/kern/sys_process.c	Fri Feb 10 00:02:13 2012	(r231320)
@@ -1145,6 +1145,8 @@ kern_ptrace(struct thread *td, int req, 
 			pl->pl_flags |= PL_FLAG_FORKED;
 			pl->pl_child_pid = td2->td_dbg_forked;
 		}
+		if (td2->td_dbgflags & TDB_CHILD)
+			pl->pl_flags |= PL_FLAG_CHILD;
 		pl->pl_sigmask = td2->td_sigmask;
 		pl->pl_siglist = td2->td_siglist;
 		strcpy(pl->pl_tdname, td2->td_name);

Modified: head/sys/sys/proc.h
==============================================================================
--- head/sys/sys/proc.h	Fri Feb 10 00:02:03 2012	(r231319)
+++ head/sys/sys/proc.h	Fri Feb 10 00:02:13 2012	(r231320)
@@ -384,6 +384,7 @@ do {									\
 				      process */
 #define	TDB_STOPATFORK	0x00000080 /* Stop at the return from fork (child
 				      only) */
+#define	TDB_CHILD	0x00000100 /* New child indicator for ptrace() */
 
 /*
  * "Private" flags kept in td_pflags:

Modified: head/sys/sys/ptrace.h
==============================================================================
--- head/sys/sys/ptrace.h	Fri Feb 10 00:02:03 2012	(r231319)
+++ head/sys/sys/ptrace.h	Fri Feb 10 00:02:13 2012	(r231320)
@@ -107,6 +107,7 @@ struct ptrace_lwpinfo {
 #define	PL_FLAG_EXEC	0x10	/* exec(2) succeeded */
 #define	PL_FLAG_SI	0x20	/* siginfo is valid */
 #define	PL_FLAG_FORKED	0x40	/* new child */
+#define	PL_FLAG_CHILD	0x80	/* I am from child */
 	sigset_t	pl_sigmask;	/* LWP signal mask */
 	sigset_t	pl_siglist;	/* LWP pending signal */
 	struct __siginfo pl_siginfo;	/* siginfo for signal */

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